A demo for the gtk.ColorButton widget

colorbuttondemo.go

package main

import (
	"fmt"
	"github.com/mattn/go-gtk/gdk"
	"github.com/mattn/go-gtk/gtk"
)

func main() {
	gtk.Init(nil)

	window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)

	vbox := gtk.NewVBox(false, 0)

	colbtn := gtk.NewColorButton()
	colbtn.SetTitle("Test")
	vbox.PackStart(colbtn, false, false, 3)

	hbox := gtk.NewHBox(false, 0)

	input := gtk.NewEntry()
	hbox.PackStart(input, true, true, 3)
	setbtn := gtk.NewButtonWithLabel("Set color")
	setbtn.Connect("clicked", func() {
		colbtn.SetColor(gdk.NewColor(input.GetText()))
	})
	hbox.PackStart(setbtn, false, false, 3)

	vbox.PackStart(hbox, false, false, 3)

	alphachk := gtk.NewCheckButtonWithLabel("Use Alpha")
	alphachk.Connect("toggled", func() {
		colbtn.SetUseAlpha(alphachk.GetActive())
	})
	vbox.PackStart(alphachk, false, false, 3)

	applybtn := gtk.NewButtonWithLabel("Apply color selection")
	applybtn.Connect("clicked", func() {
		window.ModifyBG(gtk.STATE_NORMAL, colbtn.GetColor())

		if colbtn.GetUseAlpha() {
			fmt.Printf("Alpha: %04x\n", colbtn.GetAlpha())
		} else {
			fmt.Println("Alpha not used")
		}
	})
	vbox.PackStart(applybtn, false, false, 3)

	window.Add(vbox)
	window.SetDefaultSize(500, 200)
	window.Connect("destroy", gtk.MainQuit)

	window.ShowAll()

	gtk.Main()
}